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United States Patent | 6,055,104 |
Cheng | April 25, 2000 |
A polarization beam splitter combiner uses a birefringent crystal that is a fraction of the size of conventional crystals used in similar devices. Since the crystal is considerably shorter in length, the beam passing through the crystal can be uncollimated, spreading very little from one end to the other. Launching uncollimated beams through a short small crystal obviates the requirement for lenses at the end face of the crystal having two waveguides coupled thereto. Since lenses are not required the waveguides at the input/output end face can be very closely spaced apart. Conventional lensed devices utilizing a pair of lenses at an input/output end face must be considerably larger in order to accommodate the lenses and resulting collimated beams.
Inventors: | Cheng; Yihao (36 Meadowbreeze Drive, Kanata, Ontario, CA) |
Appl. No.: | 082517 |
Filed: | May 21, 1998 |
Current U.S. Class: | 359/495; 359/494; 359/501; 385/11; 385/140 |
Intern'l Class: | G02B 005/30; G02B 006/00 |
Field of Search: | 385/140,11 359/484,494,495,493,501,496,497 356/370,368 372/703 |
4239329 | Dec., 1980 | Matsumoto. | |
5033830 | Jul., 1991 | Jameson | 359/484. |
5276747 | Jan., 1994 | Pan | 385/34. |
5499132 | Mar., 1996 | Tojo et al. | 359/484. |
5546219 | Aug., 1996 | Iida | 359/484. |
5689359 | Nov., 1997 | Kurata et al. | 359/484. |
5727109 | Mar., 1998 | Pan et al. | 385/140. |
5867300 | Feb., 1999 | Onaka et al. | 359/584. |